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<p>Reports unnecessary <code>non-sealed</code> modifiers which used on methods, fields, or variables.</p>
<p>This modifier has effect only on classes, interfaces and traits.</p>
<p><b>Example:</b></p>
<pre><code>
  <b>non-sealed</b> boolean foo() {} // modifier is unnecessary
  <b>non-sealed</b> Object bar // modifier is unnecessary

  // modifier is required and therefore not highlighted
  <b>non-sealed</b> class A {}
</code></pre>
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